Ryan C. Ungaro

13.2k total citations · 3 hit papers
197 papers, 6.8k citations indexed

About

Ryan C. Ungaro is a scholar working on Genetics, Epidemiology and Surgery. According to data from OpenAlex, Ryan C. Ungaro has authored 197 papers receiving a total of 6.8k indexed citations (citations by other indexed papers that have themselves been cited), including 153 papers in Genetics, 111 papers in Epidemiology and 71 papers in Surgery. Recurrent topics in Ryan C. Ungaro's work include Inflammatory Bowel Disease (153 papers), Microscopic Colitis (107 papers) and Eosinophilic Esophagitis (26 papers). Ryan C. Ungaro is often cited by papers focused on Inflammatory Bowel Disease (153 papers), Microscopic Colitis (107 papers) and Eosinophilic Esophagitis (26 papers). Ryan C. Ungaro collaborates with scholars based in United States, Canada and Denmark. Ryan C. Ungaro's co-authors include Jean‐Frédéric Colombel, Laurent Peyrin‐Biroulet, Saurabh Mehandru, Patrick B. Allen, Manasi Agrawal, Richard B. Gearry, Michael D. Kappelman, Erica J. Brenner, Walter Reinisch and Flávio Steinwurz and has published in prestigious journals such as The Lancet, The Journal of Experimental Medicine and SHILAP Revista de lepidopterología.

In The Last Decade

Ryan C. Ungaro

173 papers receiving 6.7k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Ulcerative colitis

2016 2.5k citations Ryan C. Ungaro, Saurabh Mehandru et al. profile →
Corticosteroids, But Not TNF Antagonists, Are Associated With Adverse COVID-19 Outcomes in Patients With Inflammatory Bowel Diseases: Results From an International Registry

2020 454 citations Erica J. Brenner, Ryan C. Ungaro et al. Gastroenterology profile →
Approach to the Management of Recently Diagnosed Inflammatory Bowel Disease Patients: A User’s Guide for Adult and Pediatric Gastroenterologists

2021 149 citations Manasi Agrawal, Elizabeth A. Spencer et al. Gastroenterology profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Ryan C. Ungaro United States	35	4.1k	2.6k	1.6k	1.4k	1.2k	197	6.8k
Whitney Tang Hong Kong	15	3.4k 0.8×	2.1k 0.8×	1.5k 1.0×	1.7k 1.2×	792 0.6×	28	5.6k
Johan Burisch Denmark	41	5.1k 1.3×	3.6k 1.4×	2.2k 1.4×	988 0.7×	991 0.8×	233	7.6k
Hai Yun Shi China	20	3.4k 0.8×	2.0k 0.8×	1.5k 1.0×	1.7k 1.3×	794 0.6×	43	5.6k
Justin C. Wu Hong Kong	15	3.2k 0.8×	2.0k 0.8×	1.8k 1.2×	1.3k 1.0×	787 0.6×	50	5.6k
Konstantinos A. Papadakis United States	44	3.8k 0.9×	2.5k 1.0×	1.5k 1.0×	1.3k 0.9×	2.5k 2.0×	95	7.1k
Joana Torres Portugal	36	3.5k 0.9×	2.5k 1.0×	1.7k 1.1×	1.1k 0.8×	899 0.7×	151	5.6k
Natalie A. Molodecky United States	17	3.0k 0.7×	2.2k 0.9×	1.7k 1.1×	896 0.7×	780 0.6×	25	5.2k
Fernando Magro Portugal	41	5.5k 1.3×	4.2k 1.6×	2.4k 1.6×	1.1k 0.8×	1.5k 1.2×	307	8.6k
Alan C. Moss United States	49	2.9k 0.7×	2.5k 1.0×	1.8k 1.2×	1.2k 0.9×	1.2k 1.0×	192	6.8k
Torsten Kucharzik Germany	50	3.7k 0.9×	2.6k 1.0×	2.5k 1.6×	1.8k 1.3×	2.6k 2.1×	198	9.2k

Countries citing papers authored by Ryan C. Ungaro

Since Specialization

Citations

This map shows the geographic impact of Ryan C. Ungaro's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Ryan C. Ungaro with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Ryan C. Ungaro more than expected).

Fields of papers citing papers by Ryan C. Ungaro

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Ryan C. Ungaro. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Ryan C. Ungaro. The network helps show where Ryan C. Ungaro may publish in the future.

Co-authorship network of co-authors of Ryan C. Ungaro

This figure shows the co-authorship network connecting the top 25 collaborators of Ryan C. Ungaro. A scholar is included among the top collaborators of Ryan C. Ungaro based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Ryan C. Ungaro. Ryan C. Ungaro is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

Renard, Bernhard Y., Louis Cohen, Carmen Argmann, et al.. (2025). Disease duration impacts intestinal gene expression profiles in Crohn’s disease but not in ulcerative colitis. Journal of Crohn s and Colitis. 19(10).

Yarur, Andrés, Thierry Dervieux, Ryan C. Ungaro, et al.. (2025). Ustekinumab Drug Clearance Is Better Associated with Disease Control than Serum Trough Concentrations in a Prospective Cohort of Inflammatory Bowel Disease. Pharmaceutics. 17(2). 187–187.

Livanos, Alexandra E., Jamie S. Ostroff, Xin Chen, et al.. (2025). ANTI-αVβ6 AUTOANTIBODIES ARE PRESENT IN COLONIC CROHN’S DISEASE AND ASSOCIATE WITH DISEASE ACTIVITY. Inflammatory Bowel Diseases. 31(Supplement_1). S14–S14. 1 indexed citations

Dubinsky, Marla C., et al.. (2024). INCREASING ACCESS TO INTERDISCIPLINARY IBD CARE FOR NEWLY DIAGNOSED IBD PATIENTS USING TELEMEDICINE: AN EXTENSION OF THE COMPASS-IBD PROGRAM. Inflammatory Bowel Diseases. 30(Supplement_1). S50–S50.

Agrawal, Manasi, et al.. (2024). High Serum Pesticide Levels Are Associated With Increased Odds of Inflammatory Bowel Disease in a Nested Case-Control Study. Gastroenterology. 168(3). 608–611.e4. 2 indexed citations

Ungaro, Ryan C., et al.. (2024). DEVELOPMENT OF CROHN'S DISEASE IN PATIENT PRESENTING WITH COMPLEX PERIANAL FISTULA TO A TERTIARY MEDICAL CARE CENTER. Inflammatory Bowel Diseases. 30(Supplement_1). S23–S24. 1 indexed citations

Uzzan, Mathieu, Laurent Peyrin‐Biroulet, Yoram Bouhnik, et al.. (2024). Screen Failures and Causes in Inflammatory Bowel Disease Randomized Controlled Trials: A Study of 16 913 Screened Patients. Inflammatory Bowel Diseases. 31(7). 1811–1818. 2 indexed citations

Narula, Neeraj, Emily C L Wong, Parambir S. Dulai, et al.. (2024). P409 Optimal endoscopic healing thresholds defined by MM-SES-CD < 22.5 and SES-CD < 4 are associated with low risk of disease progression in Crohn’s disease. Journal of Crohn s and Colitis. 18(Supplement_1). i839–i840. 1 indexed citations

Bourgonje, Arno R., Carmen Argmann, Bruce E. Sands, et al.. (2024). DOP33 Distinct perturbances in metabolic pathways associate with disease progression in patients with Inflammatory Bowel Disease. Journal of Crohn s and Colitis. 18(Supplement_1). i131–i133. 1 indexed citations

10.

Kayal, Maia, et al.. (2023). Besting the Biologics: Vancomycin Monotherapy for Ulcerative Colitis Management in Patients with Primary Sclerosing Cholangitis. Digestive Diseases and Sciences. 68(4). 1118–1120. 3 indexed citations

11.

Kayal, Maia, et al.. (2023). Net Remission Rates with Biologic and Small Molecule Treatment in Ulcerative Colitis: A Reappraisal of the Clinical Trial Data. Clinical Gastroenterology and Hepatology. 21(13). 3433–3436.e1. 12 indexed citations

12.

Colombel, Jean‐Frédéric, Ryan C. Ungaro, Bruce E. Sands, et al.. (2023). Vedolizumab, Adalimumab, and Methotrexate Combination Therapy in Crohn’s Disease (EXPLORER). Clinical Gastroenterology and Hepatology. 22(7). 1487–1496.e12. 49 indexed citations

13.

Coelho‐Prabhu, Nayantara, Ryan J. Lennon, Jessica Friton, et al.. (2023). Baseline Clinical Factors Are Associated With Risk of Complications in Crohn's Disease: Appraisal of the American Gastroenterological Association Clinical Care Pathway. The American Journal of Gastroenterology. 119(1). 147–154. 2 indexed citations

14.

Kaplan, Gilaad G., Fox E. Underwood, Stephanie Coward, et al.. (2022). The Multiple Waves of COVID-19 in Patients With Inflammatory Bowel Disease: A Temporal Trend Analysis. Inflammatory Bowel Diseases. 28(11). 1687–1695. 3 indexed citations

15.

Kayal, Maia, et al.. (2022). Net Remission Rates with Biologic Treatment in Crohn’s Disease: A Reappraisal of the Clinical Trial Data. Clinical Gastroenterology and Hepatology. 21(5). 1348–1350. 17 indexed citations

16.

Allin, Kristine H., Rikke Kart Jacobsen, Ryan C. Ungaro, et al.. (2021). Bariatric Surgery and Risk of New-onset Inflammatory Bowel Disease: A Nationwide Cohort Study. Journal of Crohn s and Colitis. 15(9). 1474–1480. 15 indexed citations

17.

Dunleavy, Katie A., et al.. (2021). Vitamin C Deficiency in Inflammatory Bowel Disease: The Forgotten Micronutrient. Crohn s & Colitis 360. 3(1). otab009–otab009. 22 indexed citations

18.

Ricciuto, Amanda, Christopher A Lamb, Eric I. Benchimol, et al.. (2021). Inflammatory Bowel Disease Clinical Activity is Associated with COVID-19 Severity Especially in Younger Patients. Journal of Crohn s and Colitis. 16(4). 591–600. 18 indexed citations

19.

Agrawal, Manasi, et al.. (2020). Su1976 THE PREVALENCE OF INCIDENTAL TERMINAL ILEITIS IN PERSONS UNDERGOING NON-DIAGNOSTIC COLONOSCOPY: A META-ANALYSIS. Gastroenterology. 158(6). S–729. 1 indexed citations

20.

Kayal, Maia, Clara Yzet, Robert Hirten, et al.. (2019). Endoscopic activity in asymptomatic patients with an ileal pouch is associated with an increased risk of pouchitis. Alimentary Pharmacology & Therapeutics. 50(11-12). 1189–1194. 17 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

Explore authors with similar magnitude of impact